Documentation of a performance with video. The background video deploys 25 of the 84,453+ videos uploaded to YouTube by the mysterious 'Webdriver Torso.' I arranged the embeds in a blog post, then screencaptured video of the resulting grid while VJ'ing it. This piece carries forward my interests in dimensionality, sociality in real and virtual spaces, and systems in general, among other things. 'Transmembrane Pressure' was created for '222444,' a net-based art, performance, and sound event for diminished states of consciousness, compromised awareness, non-linearity and where-am-I-ness, organized by Dean Terry. Following the initial live performances, broadcast via Google Hangouts as part of the Santa Fe International New Media Festival, '222444' remains viewable at 222-444.net, but only between 2:22 and 4:44AM in any time zone.